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Enterprise JavaBeans (EJB) is a component architecture for building distributed, object-oriented business applications in Java.

This whitepaper describes the features of WebLogic's implementation of the JavaSoft EJB specification (version 1.0), and discusses the benefits of using WebLogic EJB.The JavaSoft Enterprise JavaBeans (EJB) specification defines a component architecture for building distributed, object-oriented business applications in Java. The EJB architecture addresses the development, deployment, and runtime aspects of an enterprise application's life cycle.

An Enterprise JavaBean encapsulates business logic in a component framework that manages the details of security, transaction, and state management. Low-level details such as multi-threading, resource pooling, clustering, distributed naming, automatic persistence, remote invocation, transaction boundary management, and distributed transaction
management are handled by the EJB "container." This allows the EJB developer to focus on the business problem to be solved.

for read more information:
http://www.weblogic.com/docs/techoverview/ejb.html